I don't think it matters that much.
There used to be custom builds of mame that supported command.dat.... now, not so much. That isn't to say that it's gone the way of the DoDo, there are still applications that support it, but it's rather useless unless it's displayed on-screen. I think it stopped being updated simply because it's mainly useful for fighters and a new fighting game (that actually runs) hasn't been added to mame in quite some time. I figure either one would be just as good.... the one released in 2007 probably just took the one from 2005 and converted it, with minimal to no additions.